body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

code {
  font-family: source-code-pro, Menlo, Monaco, Consolas, 'Courier New',
    monospace;
}

.insert {
  display: block;
}

.alter::after {
  color: red;
  content: 'example';
}

.delete {
  display: block;
}
